The invention relates to a method for assembling and adjusting an actuator (5) of an exhaust gas turbocharger (2), and a suitable electric actuating means (6). A bypass for the exhaust gas is provided on the turbine side (3) of the exhaust gas turbocharger (2). A sub-stream of the exhaust gas can be conducted around the turbine through said bypass by means of an adjustable bypass valve. The bypass valve is actuated by means of an actuator (5), the actuating means (6) of which lies on the compressor side (7) of the exhaust gas turbocharger (2). The actuator (6) has an axially movable actuating bar (8) which is connected to a coupling element (9). The coupling element is connected to the actuating section (4) of the bypass valve by means of a pivot axis (100), said actuating section being designed as a lever arm. In order to allow the desired closed position of the bypass valve to be set during a predefined actuation of the actuating means (6), the coupling element (9) is initially still movably connected to the actuating bar (8). Subsequently, a position of the actuating means (6) that corresponds to the closed position is first set by applying a corresponding voltage to the electric actuating means (6), before being fixed. A prestressing force is then applied to the coupling element (9) coaxially to the adjusting bar (8) by means of a pneumatic actuator. In this manner, the bypass valve is forced into the closed position by means of the actuating section (4), and tolerances occurring in the system of kinematically coupled elements are eliminated in order to substantially improve the positioning accuracy during the subsequent operation of the exhaust gas turbocharger (2). The weld connection is applied in the set position by means of a welding tool.